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MTSAT 30 min (on the half hour), 4-km resolution , 3.9, 6.7, 10.8, 12.0 µm FY-2E 1 hr (on the hour), 4-km resolution (calib?) , 3.9, 6.7, 10.8, 12.0 µm Meteosat-7 30 min, 4-km resolution - GOES-13 (east): 0.73, 6.9, 11.5, µm MODIS, twice daily (Terra & Aqua), 1-km, multispectral NPP VIIRS, 1-km multispectral 1330 LT NOAA-15/16/18/19 AVHRR, later TRMM VIRS, TMI later Data
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Overview of Satellite-Derived Cirrus Properties During SPARTICUS and
MACPEX
P. Minnis, L. NguyenNASA Langley Research Center, Hampton, VA
R. Palikonda, K. Bedka, T. Chee, D. A. Spangenberg, J. K. Ayers SSAI, Hampton, VA
SEAC4RS Leadership MeetingPalmdale, CA, 31 January – 1 February 2012
OBJECTIVES
• Provide satellite complement to in situ, ground, and modeling studies• Provide high temporal resolution imagery for experiments• Provide consistent retrievals of cloud properties for experiments
• Provide real-time support in field
• Real-time imagery and interactive analysis- mission planning & execution
• Near-real time cloud retrievals
• MTSAT 30 min (on the half hour), 4-km resolution - 0.65, 3.9, 6.7, 10.8, 12.0 µm
• FY-2E 1 hr (on the hour), 4-km resolution (calib?)- 0.65, 3.9, 6.7, 10.8, 12.0 µm
• Meteosat-7 30 min, 4-km resolution- GOES-13 (east): 0.73, 6.9, 11.5, µm
• MODIS, twice daily (Terra & Aqua), 1-km, multispectral
• NPP VIIRS, 1-km multispectral 1330 LT
• NOAA-15/16/18/19 AVHRR, later
• TRMM VIRS, TMI later
Data
High-Cloud Statistics, SEAC4RS Domain0.25°, MTSAT, Aug-Sept 2008-2011
Frequency of Occurrence Fractional Coverage
• Good location for studying ice clouds• Greatest amounts & frequencies over
- Thailand, Cambodia, Bangladesh, & NE India- Gulf of Thailand, Bay of Bengal, Andaman Sea, E. South China Sea
High-Cloud Diurnal Cycle, SEAC4RS Domain0.25°, MTSAT, Aug-Sept 2008-2011
0000 UTC = 0700 LT 1200 UTC = 1900 UTC
Overshooting Tops, ExampleIR channel used to detect OT, Bedka method
1-km VIS MTSAT IR
• Detections correspond to turrets in 1-km VIS imagery
Overshooting Tops, SEAC4RS Domain0.25°, MTSAT, Aug-Sept 2005-2011
Total Occurrences Diurnal Behavior
• Most common over Thailand & Cambodia, S. China Sea, NE Indian coast• Daytime peak over land• Night peaks over coastal waters• Mixed times over open waters
Overshooting Tops, SEAC4RS Domain0.25°, MTSAT, Aug-Sept 2005-2011
Occurrences, 9 AM – 9 PM Occurrences, 9 PM – 9AM
• 9 AM - 9 PM: most over land, W. Bay of Bengal, S. China Sea• 9 PM – 9 AM: most over coastal water, S. China Sea
Overshooting Tops, SEAC4RS Domain0.25°, MTSAT, Aug-Sept 2005-2011
Convective Cycle Summary
• Over land- Peak convection occurs at ~0900 UTC (~4 PM) near coasts- Peak convection an hour or two later deep inland- Peak convection at ~ 2 AM over eastern Thai lowlands
& Nan River Basin- Minimal deep convection before 0730 UTC (~2:30 PM)
• Over water- Peak convection occurs at ~1400 UTC (~9 PM) near coasts- Peak convection moves seaward at later times- Peak convection during morning (6-10 AM) over N Bay of Bengal
Langley SEAC4RS Web Page
http://www-angler.larc.nasa.gov
Click on “SEAC4RS” on sidebar
or from main SEAC4RS page
Under construction, will add climatological info
soon+
MODIS, AVHRR, VIRS
Near-real time imagery from 3 GEOSats, 26 Jan 2012FY-2, 0801 UTC MTSAT, 0832 UTC
Met-7 IR, 1900 U Met-7 WV, 1900 U
MTSAT-2 Retrieval Domains, SEAC4RS0832 UTC, 26 Jan 2012
Domain (4-km) Large Domain (8-km)
New Satellite Prediction Tool
http://www-angler.larc.nasa.gov
/gsp
Will complement the old system
Example of Convective Object Tracking http://angler.larc.nasa.gov/site/people/data/kbedka/seacrs_objects_anim.gif
FY2-E, 28-29 Sept, 2010
IR age
Tmin OTvectors strong conv
Summary
• Capabilities on site will be much enhanced compared to online data- change resolution and domain as desired- provide exact locations of objects as needed- variety of loops and model overlays as needed- flight tracks in near real time (given the nav data)
• Add additional satellites to web page- MODIS, NPP, AVHRR, CALIPSO, CloudSat, TRMM
• Matching of data with flights and ground sites as it comes in- cloud products & radiances
• New algorithms to retrieve thin cirrus and ML clouds will be employed
• Add features as requested, if possible
August 2006-2009 September 2006-2009
Cloud Cover: 88% Multi-layer: 52%Above 15 km all cirrus are tenuous – IWC < 0.005 g/m313-15 Km Most Cirrus are tenuous - IWC < 0.01 g/m3At 10 km, most cirrus volumes have IWC > 0.05 g/m3
SEAC4RS A-Train Cloud Climatology (2006-2009) 20 degree box centered on Bangkok.
August 2006-9
September 2006-9
0 0.25 0.5 1 3 6 10
0 0.25 0.5 1 3 6 10
14
10
6
3
21
0.5
Base Height-Layer Thickness Histograms
15% TTL all < 3 km thick35% Cirrus 6-14 km > 3 km10% Cirrus 6-10 km > 6 km
Deep Echoes ~ 5% cover
20% Boundary Layer Cloudmore or less evenly distributed in thickness
Tendency for Cirrus to be lower and thicker in September.
14
10
6
3
21
0.5
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